I think the symbolism on this thing is somehow connected to the Order of the Bath. Tria juncta in uno (three connected in one) was/is their motto.
If the badge in the upper left has a rose in it, it could stand for England.
The lower symbol could represent a thistle -> Scotland.
The celtic-cross in the upper right could stand for ireland.
Maybe someone with knowledge in british heraldy can tell you more.
Best Regards,
Thilo
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